To all handcoders: How do I use cubic_patch (Message 1 to 3 of 3)
From: Joachim Häfner
Subject: To all handcoders: How do I use cubic_patch
Date: 23 Nov 2000 14:35:27
Message: <3A1D719F.EDA77634@web.de>
I'm new in POV-Ray and 3D-arts in general. While working with the docs
which came with povray I noticed that when the tutorials was talking
about cubic_patches it adviced to use a program like moray. Since I'm
interested in the whole stuff, including the handcoding I would like
to know more about how to use this w/o any other program.
Thanks a lot,
> > I'm new in POV-Ray and 3D-arts in general. While working with the docs> which came with povray I noticed that when the tutorials was talking> about cubic_patches it adviced to use a program like moray. Since I'm> interested in the whole stuff, including the handcoding I would like> to know more about how to use this w/o any other program.>
I'm not using bicubic patches very much and don't know much about them,
but the first paragraph in the docs says most things: 16 control points
define a surface that is approximated with smooth triangles.
IIRC the control points are connected in a regular grid:
+-----+-----+-----+
| | | |
| | | |
+-----+-----+-----+
| | | |
| | | |
+-----+-----+-----+
| | | |
| | | |
+-----+-----+-----+
The coordinates of the control points are used to form the patch similar
to cubic splines in 2 dimensional space.
furthermore:
http://www-personal.umich.edu/~jeffab/bicubic.html
http://www.icg.informatik.uni-rostock.de/Lehre/CG1/Geo/bezier_pov.html
Christoph
--
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/
From: Phil Clute
Subject: Re: To all handcoders: How do I use cubic_patch
Date: 23 Nov 2000 19:25:45
Message: <3A1DB59A.FCDBFA68@tiac.net>
Here's a good tutorial:
http://www-personal.umich.edu/~jeffab/tutorials.html
As for a program you could use Hammapatch(assuming your using windows):
http://www.crosswinds.net/~hamapatch/
--
Phil
...coffee?...yes please! extra sugar,extra cream...Thank you.
de>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/